Characterization and evaluation of Bacillus isolates for their potential plant growth and biocontrol activities against tomato bacterial wilt

About 200 Bacillus isolates were isolated from tomato and potato rhizosphere and examined for their antagonistic activities against Ralstonia solanacearum T-91, the causal agent of tomato bacterial wilt (TBW), in vitro and in vivo. Four strains, AM1, D16, D29 and H8, have shown high potential of antagonistic activity against the pathogen in laboratory and greenhouse experiments. In greenhouse, 81.1 to 89.0% reduction of disease incidence of TBW was recorded in treated tomato plants with 4 isolates, which also significantly (p > 0.05) increased plant height by 22.7 to 43.7% and dry weight by 47.93 to 91.55% compared with non-treated control. 16SrRNA gene sequence, the biochemical and physiological tests and fatty acid methyl esters analysis assigned strains AM1 and D29 as Bacillus amyloliquefaciens, while strains D16 and H8 as Bacillus subtilis and B. methylotrophicus, respectively. In addition, the 4 strains showed ability to inhibit growth of the three soil-borne fungi, produce indole-3- acetic acid, siderophores and also with exception of strain D16, the other 3 strains were capable of solubilizing phosphate. Therefore, these results suggest that out of 200 isolates, Bacillus stains AM1, D16, D29 and H8 support good antagonistic activity and could be applied as biocontrol agents against TBW under greenhouse conditions beside their potential to promote tomato plants growth.Key words: Tomato, Ralstonia solanacearum, Bacillus spp, biological control, plant growth promotion activitie

Synergistic effect of acetyl salicylic acid and DL-Beta-aminobutyric acid on biocontrol efficacy of Bacillus strains against tomato bacterial wilt

Nicolas Monteix et Nicolas Tran (dir.), Les savoirs professionnels des gens de métier. Études sur le monde du travail dans les sociétés urbaines de l’empire romain, Naples, Centre Jean Bérard, 2011 1 vol., 21,7 x 27,5 (Collection du Centre Jean Bérard, 37 ; Archéologie de l’artisanat antique, 5) ISSN 1590-3869 ; 37 € (Anne Daguet-Gagey). L’histoire des techniques du monde gréco-romain est un sujet qui connaît depuis plusieurs années un profond renouvellement. Plus largement, c’est la vulgate ..

Additional file 2: of Comprehensive genomic analysis of the CNGC gene family in Brassica oleracea: novel insights into synteny, structures, and transcript profiles

Multiple sequence alignment of CNGC proteins from B. oleracea, B. rapa and A. thaliana. (PDF 2222 kb

Role of Melatonin in Plant Tolerance to Soil Stressors: Salinity, pH and Heavy Metals

Melatonin (MT) is a pleiotropic molecule with diverse and numerous actions both in plants and animals. In plants, MT acts as an excellent promotor of tolerance against abiotic stress situations such as drought, cold, heat, salinity, and chemical pollutants. In all these situations, MT has a stimulating effect on plants, fomenting many changes in biochemical processes and stress-related gene expression. Melatonin plays vital roles as an antioxidant and can work as a free radical scavenger to protect plants from oxidative stress by stabilization cell redox status; however, MT can alleviate the toxic oxygen and nitrogen species. Beyond this, MT stimulates the antioxidant enzymes and augments antioxidants, as well as activates the ascorbate–glutathione (AsA–GSH) cycle to scavenge excess reactive oxygen species (ROS). In this review, we examine the recent data on the capacity of MT to alleviate the effects of common abiotic soil stressors, such as salinity, alkalinity, acidity, and the presence of heavy metals, reinforcing the general metabolism of plants and counteracting harmful agents. An exhaustive analysis of the latest advances in this regard is presented, and possible future applications of MT are discussed

La Charente

16 février 18841884/02/16 (A13,N5184)-1884/02/16.Appartient à l’ensemble documentaire : PoitouCh